diff --git a/src/Microsoft.TestPlatform.AdapterUtilities/ManagedNameUtilities/ManagedNameHelper.Reflection.cs b/src/Microsoft.TestPlatform.AdapterUtilities/ManagedNameUtilities/ManagedNameHelper.Reflection.cs
index f7c42c9f42..b5d0c32227 100644
--- a/src/Microsoft.TestPlatform.AdapterUtilities/ManagedNameUtilities/ManagedNameHelper.Reflection.cs
+++ b/src/Microsoft.TestPlatform.AdapterUtilities/ManagedNameUtilities/ManagedNameHelper.Reflection.cs
@@ -78,7 +78,7 @@ public static void GetManagedName(MethodBase method, out string managedTypeName,
     /// More information about <paramref name="managedTypeName"/> and <paramref name="managedMethodName"/> can be found in
     /// <see href="https://github.com/microsoft/vstest-docs/blob/main/RFCs/0017-Managed-TestCase-Properties.md">the RFC</see>.
     /// </remarks>
-    public static void GetManagedName(MethodBase method, out string managedTypeName, out string managedMethodName, out string[] hierarchyValues)
+    public static void GetManagedName(MethodBase method, out string managedTypeName, out string managedMethodName, out string?[] hierarchyValues)
     {
         GetManagedName(method, out managedTypeName, out managedMethodName);
         GetManagedNameAndHierarchy(method, true, out _, out _, out hierarchyValues);
@@ -102,14 +102,14 @@ public static void GetManagedName(MethodBase method, out string managedTypeName,
     /// <returns>
     /// The hierarchy values.
     /// </returns>
-    public static string[] GetManagedHierarchy(MethodBase method)
+    public static string?[] GetManagedHierarchy(MethodBase method)
     {
         GetManagedNameAndHierarchy(method, true, out _, out _, out var hierarchyValues);
 
         return hierarchyValues;
     }
 
-    private static void GetManagedNameAndHierarchy(MethodBase method, bool useClosedTypes, out string managedTypeName, out string managedMethodName, out string[] hierarchyValues)
+    private static void GetManagedNameAndHierarchy(MethodBase method, bool useClosedTypes, out string managedTypeName, out string managedMethodName, out string?[] hierarchyValues)
     {
         _ = method ?? throw new ArgumentNullException(nameof(method));
 
@@ -191,8 +191,16 @@ private static void GetManagedNameAndHierarchy(MethodBase method, bool useClosed
 
         hierarchyValues = new string[HierarchyConstants.Levels.TotalLevelCount];
         hierarchyValues[HierarchyConstants.Levels.TestGroupIndex] = managedMethodName.Substring(0, methodNameEndIndex);
-        hierarchyValues[HierarchyConstants.Levels.ClassIndex] = managedTypeName.Substring(hierarchyPos[1] + 1, hierarchyPos[2] - hierarchyPos[1] - 1);
-        hierarchyValues[HierarchyConstants.Levels.NamespaceIndex] = managedTypeName.Substring(hierarchyPos[0], hierarchyPos[1] - hierarchyPos[0]);
+        if (hierarchyPos[1] == hierarchyPos[0]) // No namespace
+        {
+            hierarchyValues[HierarchyConstants.Levels.ClassIndex] = managedTypeName.Substring(0, hierarchyPos[2]);
+            hierarchyValues[HierarchyConstants.Levels.NamespaceIndex] = null;
+        }
+        else
+        {
+            hierarchyValues[HierarchyConstants.Levels.ClassIndex] = managedTypeName.Substring(hierarchyPos[1] + 1, hierarchyPos[2] - hierarchyPos[1] - 1);
+            hierarchyValues[HierarchyConstants.Levels.NamespaceIndex] = managedTypeName.Substring(hierarchyPos[0], hierarchyPos[1] - hierarchyPos[0]);
+        }
         hierarchyValues[HierarchyConstants.Levels.ContainerIndex] = method.DeclaringType?.GetTypeInfo()?.Assembly?.GetName()?.Name ?? string.Empty;
     }
 
@@ -328,10 +336,17 @@ bool Filter(MemberInfo mbr, object? param)
             hierarchies = new int[3];
             hierarchies[0] = b.Length;
 
-            AppendNamespace(b, type.Namespace);
-            hierarchies[1] = b.Length;
+            if (type.Namespace != null)
+            {
+                AppendNamespace(b, type.Namespace);
+                hierarchies[1] = b.Length;
 
-            b.Append('.');
+                b.Append('.');
+            }
+            else
+            {
+                hierarchies[1] = hierarchies[0];
+            }
 
             AppendNestedTypeName(b, type, closedType);
             if (closedType)
diff --git a/src/Microsoft.TestPlatform.AdapterUtilities/PublicAPI/PublicAPI.Shipped.txt b/src/Microsoft.TestPlatform.AdapterUtilities/PublicAPI/PublicAPI.Shipped.txt
index a758469bac..6defd02fc2 100644
--- a/src/Microsoft.TestPlatform.AdapterUtilities/PublicAPI/PublicAPI.Shipped.txt
+++ b/src/Microsoft.TestPlatform.AdapterUtilities/PublicAPI/PublicAPI.Shipped.txt
@@ -26,8 +26,8 @@ Microsoft.TestPlatform.AdapterUtilities.TestIdProvider.GetHash() -> byte[]!
 Microsoft.TestPlatform.AdapterUtilities.TestIdProvider.GetId() -> System.Guid
 Microsoft.TestPlatform.AdapterUtilities.TestIdProvider.TestIdProvider() -> void
 static Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.ManagedNameHelper.GetManagedName(System.Reflection.MethodBase! method, out string! managedTypeName, out string! managedMethodName) -> void
-static Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.ManagedNameHelper.GetManagedName(System.Reflection.MethodBase! method, out string! managedTypeName, out string! managedMethodName, out string![]! hierarchyValues) -> void
-static Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.ManagedNameHelper.GetManagedHierarchy(System.Reflection.MethodBase! method) -> string![]!
+static Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.ManagedNameHelper.GetManagedName(System.Reflection.MethodBase! method, out string! managedTypeName, out string! managedMethodName, out string?[]! hierarchyValues) -> void
+static Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.ManagedNameHelper.GetManagedHierarchy(System.Reflection.MethodBase! method) -> string?[]!
 static Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.ManagedNameHelper.GetMethod(System.Reflection.Assembly! assembly, string! managedTypeName, string! managedMethodName) -> System.Reflection.MethodBase!
 static Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.ManagedNameParser.ParseManagedMethodName(string! managedMethodName, out string! methodName, out int arity, out string![]? parameterTypes) -> void
 static Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.ManagedNameParser.ParseManagedTypeName(string! managedTypeName, out string! namespaceName, out string! typeName) -> void
diff --git a/test/Microsoft.TestPlatform.AdapterUtilities.UnitTests/ManagedNameUtilities/ManagedNameGeneratorTests.cs b/test/Microsoft.TestPlatform.AdapterUtilities.UnitTests/ManagedNameUtilities/ManagedNameGeneratorTests.cs
new file mode 100644
index 0000000000..01406c4f6f
--- /dev/null
+++ b/test/Microsoft.TestPlatform.AdapterUtilities.UnitTests/ManagedNameUtilities/ManagedNameGeneratorTests.cs
@@ -0,0 +1,126 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Microsoft.TestPlatform.AdapterUtilities.ManagedNameUtilities.UnitTests;
+
+[TestClass]
+public class ManagedNameGeneratorTests
+{
+    [TestMethod]
+    public void Namespaceless_ClassMembers_ShouldNotReportANamespace()
+    {
+        // Arrange
+        var methodBase = typeof(global::NamespacelessClass).GetMethod("Method0")!;
+
+        // Act
+        ManagedNameHelper.GetManagedName(methodBase, out var managedTypeName, out var managedMethodName);
+
+        // Assert
+        Assert.AreEqual("NamespacelessClass", managedTypeName);
+        Assert.AreEqual("Method0", managedMethodName);
+    }
+
+    [TestMethod]
+    public void Namespaceless_RecordMembers_ShouldNotReportANamespace()
+    {
+        // Arrange
+        var methodBase = typeof(global::NamespacelessRecord).GetMethod("Method0")!;
+
+        // Act
+        ManagedNameHelper.GetManagedName(methodBase, out var managedTypeName, out var managedMethodName);
+
+        // Assert
+        Assert.AreEqual("NamespacelessRecord", managedTypeName);
+        Assert.AreEqual("Method0", managedMethodName);
+    }
+
+    [TestMethod]
+    public void Namespaceless_InnerClassMembers_ShouldNotReportANamespace()
+    {
+        // Arrange
+        var methodBase = typeof(global::NamespacelessClass.Inner).GetMethod("Method0")!;
+
+        // Act
+        ManagedNameHelper.GetManagedName(methodBase, out var managedTypeName, out var managedMethodName);
+
+        // Assert
+        Assert.AreEqual("NamespacelessClass+Inner", managedTypeName);
+        Assert.AreEqual("Method0", managedMethodName);
+    }
+
+    [TestMethod]
+    public void Namespaceless_InnerRecordMembers_ShouldNotReportANamespace()
+    {
+        // Arrange
+        var methodBase = typeof(global::NamespacelessRecord.Inner).GetMethod("Method0")!;
+
+        // Act
+        ManagedNameHelper.GetManagedName(methodBase, out var managedTypeName, out var managedMethodName);
+
+        // Assert
+        Assert.AreEqual("NamespacelessRecord+Inner", managedTypeName);
+        Assert.AreEqual("Method0", managedMethodName);
+    }
+
+    [TestMethod]
+    public void Namespaceless_ClassMembers_ShouldNotReportANamespace_InHierarchy()
+    {
+        // Arrange
+        var methodBase = typeof(global::NamespacelessClass).GetMethod("Method0")!;
+
+        // Act
+        ManagedNameHelper.GetManagedName(methodBase, out var managedTypeName, out var managedMethodName, out var hierarchyValues);
+
+        // Assert
+        Assert.AreEqual("NamespacelessClass", managedTypeName);
+        Assert.AreEqual("Method0", managedMethodName);
+        Assert.IsNull(hierarchyValues[HierarchyConstants.Levels.NamespaceIndex]);
+    }
+
+    [TestMethod]
+    public void Namespaceless_RecordMembers_ShouldNotReportANamespace_InHierarch()
+    {
+        // Arrange
+        var methodBase = typeof(global::NamespacelessRecord).GetMethod("Method0")!;
+
+        // Act
+        ManagedNameHelper.GetManagedName(methodBase, out var managedTypeName, out var managedMethodName, out var hierarchyValues);
+
+        // Assert
+        Assert.AreEqual("NamespacelessRecord", managedTypeName);
+        Assert.AreEqual("Method0", managedMethodName);
+        Assert.IsNull(hierarchyValues[HierarchyConstants.Levels.NamespaceIndex]);
+    }
+
+    [TestMethod]
+    public void Namespaceless_InnerClassMembers_ShouldNotReportANamespace_InHierarchy()
+    {
+        // Arrange
+        var methodBase = typeof(global::NamespacelessClass.Inner).GetMethod("Method0")!;
+
+        // Act
+        ManagedNameHelper.GetManagedName(methodBase, out var managedTypeName, out var managedMethodName, out var hierarchyValues);
+
+        // Assert
+        Assert.AreEqual("NamespacelessClass+Inner", managedTypeName);
+        Assert.AreEqual("Method0", managedMethodName);
+        Assert.IsNull(hierarchyValues[HierarchyConstants.Levels.NamespaceIndex]);
+    }
+
+    [TestMethod]
+    public void Namespaceless_InnerRecordMembers_ShouldNotReportANamespace_InHierarchy()
+    {
+        // Arrange
+        var methodBase = typeof(global::NamespacelessRecord.Inner).GetMethod("Method0")!;
+
+        // Act
+        ManagedNameHelper.GetManagedName(methodBase, out var managedTypeName, out var managedMethodName, out var hierarchyValues);
+
+        // Assert
+        Assert.AreEqual("NamespacelessRecord+Inner", managedTypeName);
+        Assert.AreEqual("Method0", managedMethodName);
+        Assert.IsNull(hierarchyValues[HierarchyConstants.Levels.NamespaceIndex]);
+    }
+}
diff --git a/test/Microsoft.TestPlatform.AdapterUtilities.UnitTests/TestClasses.cs b/test/Microsoft.TestPlatform.AdapterUtilities.UnitTests/TestClasses.cs
index 77d0a713ce..44c8f3f1ca 100644
--- a/test/Microsoft.TestPlatform.AdapterUtilities.UnitTests/TestClasses.cs
+++ b/test/Microsoft.TestPlatform.AdapterUtilities.UnitTests/TestClasses.cs
@@ -4,11 +4,11 @@
 using System;
 using System.Collections.Generic;
 
-namespace TestClasses;
-
 #pragma warning disable IDE0060 // Remove unused parameter
 #pragma warning disable CA1822 // Mark members as static
-internal class Outer
+#pragma warning disable IDE0161 // Convert to file-scoped namespace
+
+internal class NamespacelessClass
 {
     public void Method0() { }
     public void Method1(int i) { }
@@ -23,83 +23,118 @@ internal class Inner
     }
 }
 
-internal class OuterPrime : Outer { }
-
-internal class Outer<T>
+internal record NamespacelessRecord
 {
     public void Method0() { }
-    public void Method1(T t) { }
-    public void Method2<U>(U[] u) { }
-    public void Method3<U>(T t, U u) { }
+    public void Method1(int i) { }
+    public void Method2(List<string> ls) { }
+    public void Method3(string p, int l) { }
+    internal record Inner
+    {
+        public void Method0() { }
+        public void Method1(int i) { }
+        public void Method2<U>(int i) { }
+        public void Method3<U, T>(int i) { }
+    }
+}
+
+namespace TestClasses
+{
+    internal class Outer
+    {
+        public void Method0() { }
+        public void Method1(int i) { }
+        public void Method2(List<string> ls) { }
+        public void Method3(string p, int l) { }
+        internal class Inner
+        {
+            public void Method0() { }
+            public void Method1(int i) { }
+            public void Method2<U>(int i) { }
+            public void Method3<U, T>(int i) { }
+        }
+    }
+
+    internal class OuterPrime : Outer { }
 
-    internal class Inner<V>
+    internal class Outer<T>
     {
         public void Method0() { }
         public void Method1(T t) { }
-        public void Method2(V v) { }
-        public void Method3<U>(T t, U u, V v) { }
-        public void Method4<U, X>(X x, U u) { }
-        public void Method5<U, X>(List<X> x, U u) { }
+        public void Method2<U>(U[] u) { }
+        public void Method3<U>(T t, U u) { }
 
-        internal class MoreInner<I>
+        internal class Inner<V>
         {
-            public void Method0<U>(T t, V v, I i, U u) { }
+            public void Method0() { }
+            public void Method1(T t) { }
+            public void Method2(V v) { }
+            public void Method3<U>(T t, U u, V v) { }
+            public void Method4<U, X>(X x, U u) { }
+            public void Method5<U, X>(List<X> x, U u) { }
+
+            internal class MoreInner<I>
+            {
+                public void Method0<U>(T t, V v, I i, U u) { }
+            }
         }
     }
-}
 
-internal class OuterPrime<Z> : Outer<Z> { }
+    internal class OuterPrime<Z> : Outer<Z> { }
 
-internal class OuterPrime<Y, Z> : Outer<Z> { }
+    internal class OuterPrime<Y, Z> : Outer<Z> { }
 
-internal class OuterString : Outer<string> { }
+    internal class OuterString : Outer<string> { }
 
-internal interface IImplementation
-{
-    void ImplMethod0();
-    void ImplMethod1(int i);
-}
+    internal interface IImplementation
+    {
+        void ImplMethod0();
+        void ImplMethod1(int i);
+    }
 
-internal class Impl : IImplementation
-{
-    void IImplementation.ImplMethod0() { }
-    void IImplementation.ImplMethod1(int i) { }
-}
+    internal class Impl : IImplementation
+    {
+        void IImplementation.ImplMethod0() { }
+        void IImplementation.ImplMethod1(int i) { }
+    }
 
-internal interface IImplementation<T>
-{
-    void ImplMethod0();
-    void ImplMethod1(T t);
-    void ImplMethod2<U>(T t, U u, string s);
-}
+    internal interface IImplementation<T>
+    {
+        void ImplMethod0();
+        void ImplMethod1(T t);
+        void ImplMethod2<U>(T t, U u, string s);
+    }
 
-internal class Impl<T> : IImplementation<T>
-{
-    void IImplementation<T>.ImplMethod0() { }
-    void IImplementation<T>.ImplMethod1(T t) { }
-    void IImplementation<T>.ImplMethod2<U>(T t, U u, string s) { }
-}
+    internal class Impl<T> : IImplementation<T>
+    {
+        void IImplementation<T>.ImplMethod0() { }
+        void IImplementation<T>.ImplMethod1(T t) { }
+        void IImplementation<T>.ImplMethod2<U>(T t, U u, string s) { }
+    }
 
-internal class Overloads
-{
-    public void Overload0() { }
-    public void Overload0(int i) { }
-    public void Overload0(int i, Overloads c) { }
-    public unsafe void Overload0(int* p) { }
-    public void Overload0(dynamic d) { }
-    public void Overload0<U>(U u) { }
-    public void Overload0<U>() { }
-    public void Overload0<U, T>() { }
-    public void Overload0<U>(U[] u) { }
-    public void Overload0<U>(U[][] u) { }
-    public void Overload0<U>(U[,] u) { }
-    public void Overload0<U>(U[,,] u) { }
-    public void Overload0<U>(List<int> l) { }
-    public void Overload0<U>(List<U> l) { }
-    public void Overload0<U, V>(Tuple<U, V> t0, Tuple<V, U> t1) { }
-    public void Overload0(Tuple<Tuple<string[,], int>> t0) { }
-    public void Overload0(Tuple<Tuple<string>, Tuple<int>> t) { }
-    public void Overload0<U>(Tuple<Tuple<Outer<U>.Inner<U>>> t) { }
+    internal class Overloads
+    {
+        public void Overload0() { }
+        public void Overload0(int i) { }
+        public void Overload0(int i, Overloads c) { }
+        public unsafe void Overload0(int* p) { }
+        public void Overload0(dynamic d) { }
+        public void Overload0<U>(U u) { }
+        public void Overload0<U>() { }
+        public void Overload0<U, T>() { }
+        public void Overload0<U>(U[] u) { }
+        public void Overload0<U>(U[][] u) { }
+        public void Overload0<U>(U[,] u) { }
+        public void Overload0<U>(U[,,] u) { }
+        public void Overload0<U>(List<int> l) { }
+        public void Overload0<U>(List<U> l) { }
+        public void Overload0<U, V>(Tuple<U, V> t0, Tuple<V, U> t1) { }
+        public void Overload0(Tuple<Tuple<string[,], int>> t0) { }
+        public void Overload0(Tuple<Tuple<string>, Tuple<int>> t) { }
+        public void Overload0<U>(Tuple<Tuple<Outer<U>.Inner<U>>> t) { }
+    }
 }
+
+#pragma warning restore IDE0161 // Convert to file-scoped namespace
 #pragma warning restore IDE0060 // Remove unused parameter
 #pragma warning restore CA1822 // Mark members as static
diff --git a/test/TestAssets/CILProject/CILProject.proj b/test/TestAssets/CILProject/CILProject.proj
index 9d57990289..ec8caa12cf 100644
--- a/test/TestAssets/CILProject/CILProject.proj
+++ b/test/TestAssets/CILProject/CILProject.proj
@@ -10,7 +10,7 @@
     <Target Name="CreateManifestResourceNames" Condition="'@(EmbeddedResource)' != ''" />
 
     <PropertyGroup>
-        <TargetFramework>net462</TargetFramework>
+        <TargetFramework>$(NetFrameworkMinimum)</TargetFramework>
         <OutputPath>bin\$(Configuration)</OutputPath>
         <RunningOnUnix Condition="$([MSBuild]::IsOSUnixLike())">true</RunningOnUnix>
         <RunningOnUnix Condition="'$(RunningOnUnix)' == ''">false</RunningOnUnix>